Watercooling problem - high temperatures

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stmblaster

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Jul 30, 2013
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Hello,

Recently , I'm having issues with my watercooling setup. I have 4 cards in 4-way sli , the waterblocks are in series , there is Laing D5 Vario pumping the water.

The problem: Card #1 sits at 44-45 degrees during load , same as Card#4 and cards #2 & #3 at 75 , 86.

Things I've tried so far: re-seat all the blocks , verify contact with thermal surface , reapply thinner and thicker layer of thermal compound (Arctic Silver 5) , removed air from the blocks/rads. The cards have not been overclocked so there shouldn't be any damage done to them. All the cards idle @ 25-32 degrees.

What else should I check for?

P.S.: This happened after I took out all of the cards and added the backplates (All blocks are XSPC).
 
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stmblaster

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Jul 30, 2013
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10,510


All blocks are about 2 weeks old , I have replaced all the water with Mayhems Ultra Pure H2O , used biocide and silver coil. There are 2 480 Rads cooling all of the cards , one before the blocks and one after.

 
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stmblaster

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Jul 30, 2013
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Do you mean the waterblock?

 
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manofchalk

manofchalk

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May 11, 2012
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If this only started happening after you installed back plates, that would give you somewhere to start. Maybe your cards were designed to dissipate some heat passively from the top of the card?

Four cards in Series is a massive amount of flow resistance for a single pump to deal with. I suggest you parallel them all, which will drastically reduce their total flow resistance.
Pretty much do this.
http://www.swiftech.com/images/komodo-TRIPLE-SLI-PARALLEL-SETUPx800.jpg
 
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stmblaster

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Jul 30, 2013
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There is also this: before installing the backplates , all cards were fine , only the 3rd one which has higher clocks was getting 47-48 , rest of them were sitting @ 45 degrees during Furmark. So even though parallel may be better , it doesn't explain how in series , card 1 and 4 are cool and 2 and 3 hot it makes no sense , there are no rads or anything between the cards , only sli bridges.
 
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stmblaster

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Jul 30, 2013
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Ok , so after swapping cards 3 and 4 , the same card overheats , just that it is now on position 4 instead of 3 so that takes me to knowing the block is the problem. What can I do there?
 
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manofchalk

manofchalk

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May 11, 2012
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Maybe the block is gunked up, if its possible you may want to disassemble the block and see. Could also be a corrosion issue.
If you don't want to do that, a hot vinegar/distilled water solution might help clean it out (20/80 ratio). Just take the card out, pour the solution in, block the ports and give it a shake. Repeat a few times and rinse with plain distilled.
 
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